P. Naga Lakshmi, R. Ashok Kumar, and K. Hari Krishna
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Electric Spring, renewable energy source, storage device, DC Micro-grid, bidirectional converter, critical load, voltage stabilization
For clean and renewable energy, microgrid is a vital process. Due to increasing penetration of renewable energy sources, requirement for DC microgrids is rising. Because of intermittent renewable energy sources, DC microgrids have to deal with unstabilized and fluctuating DC bus voltage. While designing and controlling of DC microgrids, main dominant problems to be considered are sudden changes in load, synchronization and interconnection of power converters, intermittent power generation of renewable energy sources. Electric springs are alternative to conventional energy storage systems for regulating and stabilizing load voltage and to mitigate ripples in voltage. In this paper, DC electric spring for DC microgrid to stabilize bus voltage and to protect critical loads using DC–DC bidirectional converter is proposed. DC electric spring connected in series with non-critical load will act like a smart load and protects critical load, which is connected in parallel with non- critical load, from voltage fluctuations and ripples. DC microgrid and electric spring are modelled using MATLAB/SIMULINK, and results are presented to check efficacy of proposed technique.
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